Why did I receive a ticket for smoking my E-Cig in the airport?

I use the E-Cig which gives me the action of smoking, without the smoke, instead using water vapor mixed with nicotine. I use this as a healthy alternative to smoking. I was under the impression that one could simply use this device literally anywhere, due to it being water vapor and not smoke. I was walking through the airport, e-cig in hand, taking a "drag" of the water vapor when a airport police officer came up to me rather hastily. The officer had informed me that if I did not put my cigarette out, that I would be forced to leave the premises. I tried to explain that it was an e-cig, but the officer was stuck on his remark. Being that I thought i was in my own right, I disregarded his comment, again arguing that it was not a cigarette. Ultimately, the officer became agitated with me and I was escorted back to a little "Police Office" within the airport. I was held in the office for roughly a half hour, almost causing me to miss my flight. During that time, my basic contact information was taken. One of the other officers came into the office, I'm assuming to start his shift, and actually ended up speaking on my behalf, or the e-cig's behalf. The officer vouched that it was indeed not a cigarette, but a water vapor device, made to look like a cigarette(even the end lights up). So with everything in the clear, making it on the flight, making it home and all that, when its all said and done, why am I still receiving a "ticket" for smoking in the airport?

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